/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayAbilityBlueprint.h
Returns the most base gameplay ability blueprint for a given blueprint (if it is inherited from another ability blueprint, returning null if only native / non-ability BP classes are it's parent)
static [UGameplayAbilityBlueprint](API\Plugins\GameplayAbilities\UGameplayAbilityBlueprint) * FindRootGameplayAbilityBlueprint ( [UGameplayAbilityBlueprint](API\Plugins\GameplayAbilities\UGameplayAbilityBlueprint) * DerivedBlueprint )